Ionic Formulae

• Ionic formula


  Shows the charges of the ions in the formula
• Writing ionic formula of compounds

  1. Follow the rules learned previously

  2. Include the charge on the ions
• Metal ion


  Positive
• Non-metal ion


  Negative
• The charge on the metal ion never changes
• Ionic formulae


  • Magnesium fluoride: Mg2+ (F-)2